What can cause "The specified string is not in the form required for an e-mail address"?

Question

What can cause the error "The specified string is not in the form required for an e-mail address"?

Source code line that causes the error:

msg.To.Add(new MailAddress("txtEmail.Text"));

Answer 1

Guess what the issue was for us?

Trailing spaces. For some reason, when you use a multi-line text box, spaces are added to the front of the string.

When we used Trim on the string, it worked fine.

Answer 2

msg.To.Add(new MailAddress("txtEmail.Text"));

is the problem. txtEmail.Text is not an e-mail address. If that's a text file that's a list of e-mails, you're going to need to open it and read it and pass them in one by one.

If it's referring to a textbox, take the quotes around it off. Like this:

msg.To.Add(new MailAddress(txtEmail.Text));

Answer 3

For me, the problem was using semi-colon(;) to seperate multiple emails. Once I change it to comma(,) it works. Hope this helps someone.

Answer 4

The issue on the code above might have occured due to

msg.To.Add(new MailAddress("txtEmail.Text"));

You might be clear that here "txtEmail.Text" appears as a string but not the mailing address to whom the mail is to be send. So code should be replaced with

msg.To.Add(new MailAddress(txtEmail.Text));

and sometimes the error like "The specified string is not in the form required for an e-mail address" might also occur due to use of improper string.As even I faced it.

Basically I was working in email sending task using the ASP.Net. The main issue for me was sending mail to multiple users. Firstly, I retrieved the email address from database and used " ; " so as to separate the multiple email addresses. Because while sending the email to multiple users, in regular basis we use semicolon i.e. " ;"

Everything seemed ok but after compilation I got the error "The specified string is not in the form required for an e-mail address".

After a bit analysis, I came to know that instead of using the " ; " we should use " , " so as to separate multiple email address while sending mails . This is the formatted string for separating the emails.

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Thank you!

Answer 5

both the sender and recipient address need to be a valid email address format. eg. [email protected]